Based on Nucleosynthesis

Zeq 6000 is the red-shift of the universe when it changed from being radiation dominated to matter dominated. The characteristic amplitude of this stochastic background is /tchar 10 (/h//) for / /h. 

The stochastic background spectrum in this scenario is flat over many decades of frequency including the range from the ELF band to the HE band. The last two decades of the ELF band, Hz, however, contain waves 

The spectrum of the stochastic background of gravitational waves depends on the details of the inflation model as well as on the assumptions about the initial state of gravitational waves produced by the big bang. 

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Almost 20 years after Goldschmidt, Suess and Urey (1956) published a new abundance table, which in part relied on solar abundances. In addition, Suess and Urey (1956) introduced arguments based on nucleosynthesis. Their so-called semiempirical abundance rules, primarily the smooth abundance variation of odd-mass nuclei with increasing mass number, were applied to estimate abundances for elements for which analytical data from meteorites were not available or had large errors. The Suess and Urey compilation was very influential for theories of nucleosynthesis and for the development of nuclear astrophysics in general. Later compilations by Cameron (1973), Anders and Grevesse (1989), Palme and Beer (1993), and others took into account improved analytical data on meteorites and the more accurate determination of elemental abundances in the solar photosphere. Over the... 

Figure 8 also shows the evolution of the Li abundance in a standard model of galactic chemical evolution. In the case of Li, new data [77, 78, 79, 80, 81, 82] lie a factor - 1000 above the BBN predictions [83], and fail to exhibit the dependence on metallicity expected in models based on nucleosynthesis by Galactic cosmic rays [84, 85, 86]. On the other hand, the Li abundance may be explained by pre-Galactic Population-Ill stars, without additional overproduction of Li [87, 88]. Some exotic solutions to both lithium problems involving particle decays in the early universe have been proposed [89, 90, 91, 92, 93,94, 95,96,97,98], but that goes beyond the scope of this review. 

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